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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76ec774f21c6ab943c34d2e63e320f472e36a6f2383df6088556158d53cb2366' 
  AND token = 'rPHh1Ql+jodaa0kfK9oxUCaPyCwro0thGMQZ09116Bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}